Faculty Book Chapters

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  Mohamed Galal (1906-1943): A pioneering egyptian anthropologist

  Nicholas S. Hopkins

  [no abstract provided]

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  Multi-resolution broadcasting over the Grassmann and stiefel manifolds

  Mohammad T. Hussien, Karim G. Seddik, Ramy H. Gohary, Mohammad Shaqfeh, and Hussein Alnuweiri

  We consider the design of space-time codes for multi-resolution multiple-input multiple-output (MIMO) broadcast communication systems. Two classes of receivers are considered: high-resolution (HR) receivers, which have access to reliable channel state information (CSI) and can perform coherent detection, and low-resolution (LR) receivers which do not have access to CSI and can only perform non-coherent detection. We propose a layered encoding structure, whereby, for the LR receivers, the transmitted codewords are chosen to be points on the Grassmann manifold whereas, for the HR receivers, incremental information is encoded in the particular bases of the transmitted codewords, thereby representing points on the Stiefel manifold. For the HR receivers, we develop a computationally-efficient two-step detector. Using this detector, we show that the proposed structure enables reliable coherent communication of the incremental HR information without compromising the reliability with which the basic LR information is non-coherently communicated. We also show that this structure enables full diversity to be achieved for both LR and HR receivers. Finally, we show that this structure achieves the maximum number of degrees of freedom for non-coherent LR channels and coherent HR channels with unitarily-constrained input signals. © 2014 IEEE.

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  Layered coding with non-coherent and coherent layers over fading channels

  Mohammad T. Hussien, Karim G. Seddik, Mohammad Shaqfeh, and Hussein Alnuweiri

  In this paper, we consider a novel layered coding approach with two layers. One of the two layers, denoted by the base-layer, can be received by any receiver even if it does not have reliable channel estimates. The other, refining-layer can only be received by any receiver that has channel state information. We propose signal constellations that allow the transmission of coherent and non-coherent information for the single-antenna transmitters. We derive upper bounds for the pairwise error probability for the coherent and non-coherent receivers and prove that our proposed signal constellations can achieve a diversity of order M for the 1 × M system, for both the coherent and non-coherent receivers. © 2014 IFIP.

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  The design and implementation of a constrained WSN for permaculture farming in Egypt

  Ahmed Ismail and Karim Seddik

  [abstract not available]

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  Using ICT for development, societal transformation, and beyond: Closing the digital divide in developing countries: Case of Egypt

  Sherif Kamel

  [no abstract provided]

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  Performance evaluation of censoring-enabled systems for sequential detection in large wireless sensor networks

  Mohammed Karmoose, Karim G. Seddik, and Ahmed K. Sultan

  In this paper, we consider a sequential binary hypothesis testing framework in wireless sensor networks. We study the effect of sensor censoring on network performance in terms of the average error probability and average number of observations required until a global decision is made. The detection process is mathematically modeled as a random walk process with two absorbing barriers. We resort to Chernoff bound in order to find upper bounds on the error probabilities and the average stopping time. The main contribution of this paper is to prove that in a sequential binary hypothesis network where sensors send their hard decisions to the fusion center, censoring can enhance the network performance in comparison to non-censoring networks in certain SNR regimes. Numerical evaluation is provided to illustrate the gains achieved through censoring. © 2014 IFIP.

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  Cheap and efficient plasmonic solar cell

  Ahmed E. Khalifa and Mohamed A. Swillam

  Plasmonic solar cell is a very promising structure for high efficient solar cell application. It has some unique characteristics that allow high energy localization and higher solar energy absorption. Most of the proposed designs are based on using noble metals such as gold and silver to achieve the plasmonic effect. These metals are, however, expensive and increase the cost of the solar cell. Thus, the need to propose novel and cheap material with plasmonic like effect is of prime importance. In this work we demonstrate the applications of TiN that has good plasmonic like effect over wide bandwidth. A detailed comparative study of TiN and silver in an optimized design is presented, and we report comparable TiN field localization and light scattering effects. In addition, TiN is more compatible with the CMOS fabrication technology than the conventional plasmonic metals, which can even ease the integration with other optoelectric devices. Should the electrical performance be further studied and optimized, the overall efficiency of the solar cell can be maintained and/or enhanced and total cost/watt dramatically reduced. © 2014 SPIE.

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  Design optimization of batteryless photovoltaic-powered reverse osmosis water desalination in remote areas

  Jihun Kim, Karim Hamza, Mohamed El-Morsi, Ashraf O. Nassef, and Sayed Metwalli

  [abstract not available]

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  Multi-level design optimization of reverse osmosis water desalination powered via photovoltaic panels with battery storage

  Jihun Kim, Karim Hamza, Mohamed El-Morsi, Ashraf O. Nassef, and Sayed Metwalli

  [abstract not available]

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  Integrated coupled multi-stage plasmonic resonator for on-chip sensing

  Rehab Kotb, Yehea Ismail, and Mohamed A. Swillam

  A sharp resonance, narrow bandwidth plasmonic cascaded nanofilter is proposed. The resonator is based on Metal- Insulator-Metal (MIM) plasmonic waveguide which has the ability to confine light at sub-wavelength scale. The proposed inline resonator features low loss, compact size, and good sensing characteristics which opens the door for many nanophotonic applications. This structure can be used in many applications such as sensing, biomedical diagnostics and on-chip optical interconnects. For example, it can be used as a highly effective integrated sensor with sensitivity up to 3000 nm RIU -1. © 2014 SPIE.

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  Plasmonic tunable nano-filter

  Rehab Kotb, Yehea Ismail, and Mohamed A. Swillam

  In this paper, a tunable nano-filter with simple tuning mechanism and wide range of wavelength selectivity is proposed. The structure of the filter is based on MIM waveguide configuration. The filter response can be controlled electrically in efficient and accurate manner. The applications and advantages of this novel tunable filter structure are discussed in details. © 2014 IEEE.

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  A quantitative study of Wi-Fi interference on PRP-ZigBee

  Aya Mahgoub, Dina Nadeem, Hadeer Ahmed, Hassan H. Halawa, and Markus Rentschier

  [abstract not available]

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  Light redirecting system using sine-wave based panels for dense urban areas

  Mohamed W.N. Mohamed, Islam A. Mashaly, Osama N. Mohamed, Sally I. El-Henawy, and Ola Galal

  [abstract not available]

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  Effect of the resistance of open and short faults on the production testing of MCML gates

  R. Mohie El-Din, A. S. Emara, S. H. Amer, M. M. Fouad, and A. H. Madian

  [abstract not available]

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  Orientalism and the construction of the apolitical Buddhist subject

  Ian Anthony Morrison

  [no abstract provided]

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  Negative capacitance circuits for process variations compensation and timing yield improvement

  Hassan Mostafa, Mohab Anis, and Mohamed Elmasry

  [abstract not available]

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  Fuzzy feed rate controller for a machining robot

  Fusaomi Nagata, Akimasa Otsuka, Keigo Watanabe, and Maki K. Habib

  A cast metal is generally produced by using a sand mold. A foamed polystyrene mold is used as the master mold for making the corresponding sand mold. Recently, the development of a flexible machining robot for foamed polystyrene materials is expected in the cast metal industries because of the high cost and inefficiency of conventional large-sized CNC machine tools. In this paper, a flexible machining system integrated with an industrial robot is proposed for foamed polystyrene materials. A compact and light weight tool is developed and attached to the arm tip. The tool's feed rate is skillfully regulated by a fuzzy reasoning method. The design of the flexible machining robot controlled using the developed fuzzy feed rate controller is presented for foamed polystyrene materials. © 2014 IEEE.

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  From constituting communities to dividing districts: The formalization of a cultural border between mombasa and its hinterland

  Daren Ray

  [no abstract provided]

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  Simulative comparison of parallel redundant wireless systems with OMNet++

  Markus Rentschler, Hassan H. Halawa, Ramez M. Daoud, Hassanein H. Amer, and Ahmed T. Elsayed

  Parallel redundant point-to-point transmission utilizing a dual-radio wireless infrastructure has been identified as a powerful approach to improve the performance of wireless communication. This method can be applied for every existing wireless standard, but has not been deeply researched so far. To fill this gap, an OMNet++ simulation model for IEEE 802.11g (Wi-Fi) and IEEE 802.15.4 (ZigBee) is developed and some simulation scenarios performed to get a better understanding of the comparative performance characteristics of parallel redundant operation for these wireless standards. © 2014 IEEE.

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  2D cutting stock problem using hybrid 3-D overlapped grouping Genetic Algorithm

  Maged R. Rostom, Ashraf O. Nassef, and Sayed M. Metwalli

  [abstract not available]

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  An overview of the evidence for tuberculosis from ancient Egypt

  Lisa Sabbahy Dr.

  The study of human remains from ancient Egypt and Nubia has captured the imagination of many people for generations, giving rise to the discipline of palaeopathology and fostering bioarchaeological research. This book contains 16 papers that cover material presented at a workshop entitled 'Palaeopathology in Egypt and Nubia: A Century in Review,' held at the Natural History Museum, London (August 29-30, 2012), which formed part of a three-year research project, 'Sir Grafton Elliot Smith: Palaeopathology and the Archaeological Survey of Nubia.' The papers explore the subject of palaeopathology from its beginnings in the early 1900s through to current research themes and the impact of technological development in the field. Revealing the diverse range of methods used to study human remains in these regions, the book gives readers an insight into the fascinating work carried out over the last century, and suggests some possible future directions for the field.

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  'I dreamed of being a people': Egypt's revolution, the people and critical imagination

  Hanan Sabea

  [no abstract provided]

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  Experimental investigation on shear strength of elastic end-web panels strengthened with CFRP strips

  S. S. Safar and Mohamed N. Abou-Zeid

  An experimental program was conducted to investigate the shear strength of elastic end-web panels of steel plate girders strengthened with intermediate-modulus carbon fiber-reinforced polymers, CFRP, strips. Test parameters included; number of strips, aspect ratio of end-web panel and width-to-thickness ratio of web plate. Twelve plate girder specimens composed of mild-steel were loaded in a four-point bending test till failure. The girders were proportioned so that the load capacity was governed by elastic web buckling. Four specimens were not strengthened to serve as reference girders whereas the remaining specimens were strengthened by applying CFRP strips in the diagonal tension direction on one or both sides of the web. Test results indicated that the buckling strength of strengthened specimens was not improved, however, the ultimate shear strength increased by 6% to up to 120% due to significant increase in post-buckling strength. The increment in post-buckling strength due to pasting CFRP strips on web plate was several multiples of that of reference girders and was reduced when slender web plates or long end-web panels were utilized. In addition to higher ultimate shear capacity, it was observed that vertical deflections, out-of-plane displacements of the web and bending curvature of transverse stiffeners of strengthened girders were reduced at ultimate load. It was concluded that the ultimate shear strength of elastic end-web panels was successfully improved using intermediate-modulus CFRP strips. On the other hand, current design rules adopted by current AISC specifications need to be revised to account for post-buckling strength of elastic end-web panels.

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  Hierarchical prior zero-forcing for cognitive relaying

  Feeby Salib and Karim G. Seddik

  In this paper, cognitive radio relaying in the physical layer is investigated where the cognitive base station (CBS) relays the PU's signal while transmitting its own signals to its secondary users (SUs). A new and simple linear method for beamforming, based on zero-forcing beamforming, adapted for the different levels of priority that users may possess in a cognitive radio network, is proposed and the special case of two SUs is analytically studied. © 2014 IEEE.

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  On the stability of random multiple access with feedback exploitation and queue priority

  Karim G. Seddik

  In this paper, we study the stability of two interacting queues under random multiple access in which the queues leverage the feedback information. We derive the stability region under random multiple access where one of the two queues exploits the feedback information and backs off under negative acknowledgement (NACK) and the other, higher priority, queue will access the channel with probability one. We characterize the stability region of this feedback-based random access protocol and prove that this derived stability region encloses the stability region of the conventional random access (RA) scheme that does not exploit the feedback information. © 2014 IEEE.